Method of and apparatus for cold-rolling metal.



P. B. ABRAMSEN.

METHOD OF AND APPARATUS FOR COLD ROLLING METAL.

APPLiCATlON FILED DEC.I8.19L3. RENEWED NOV: 13. 1915.

Patented July 11, 1916.

3 SHEETS-SHEET l.

LAQWGQ INVENTOH P. B. ABRAIVISEN.

METHOD OF AND APPARATUS FOR COLD ROLLING METAL.

APPLICATION man DEC-18,1913. RENEWED NOV. 13.1915.

1 T 9&69. Patented July 11, 1916.

3 SHEETS-SHEET 2.

WITNESSES I ZEEINVENTOR F. B. ABRAMSEN.

METHOD OF AND APPARATUS FOR COLD ROLLING METAL.

APPLICATION FILED DEC. 18. I913. RENEWED NOV. 13.1915.

Patented J'ul 11, 1910.

BETTER B.

ABRAMSEN,

OF KNOXVILLE.

PENNSYLVANIA.

METHOD OF AND APPARATUS FOR COLD-ROLLING METAL.

Application filed December 18, 1913, Serial No. 807,422.

To all whom it may concern Be it known that I, Pn'r'rnn B. ABRAMSEN, a subject of the King of Norway, residing at Knoxville, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Methods of and Apparatus for Cold-Rolling Metal, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a plan view of a portion of the apparatus employed in carrying out my invention; Fig. 2 is a section on the hne IIII of Fig. 1; Fig. 3 is a diagram illus trating my improved method with one form of apparatus; and Fig. 4 is a similar view,

but showing modified apparatus.

My invention has relation to the art of cold rolling metal rods and round bars; and is designed to provide a simple and effective method by which this work may be acc11- rately carried out with the production of rods and bars free from kinks and bends and objectionable surface markings.

My invention also provides suitable mechanism of simple character and construction for carrying out this method;

In accordance with my invention, I subject the previously rolled blanks to the operation of peculiarly arranged cross rolls. I preferably arrange these cross rolls in two groups or sets, each group or set consistlng in two pairs of cross rolls. The first group or set constitutes the reducing and sizing rolls while the second set or group forms the finishing rolls. Corresponding cross rolls in the two sets or groups are rotated in reverse directions. In this manner the finishing rolls remove any surface markings which may be formed by the reducing and sizing rolls.

Referring first to the apparatus illustrated diagrammatically in Fig. 3, the numerals 2 and 3 designate the respective rolls of the first pair of cross rolls of the first group or set and 4 and 5 designate the rolls of the second pair of cross rolls of this group or set. 6 designates a pressure roll which I preferably employ intermediate the two pairs of cross rolls. 7 and 8. designate the cross rolls of the first pair of rolls of the second set or group, and 9 and 10 the cross rolls of the second pair of said set or group. 11 is an intermediate pressure roll similar to the roll 6. One roll, at least, of each pair of Specification of Letters Patent.

Patented July lljl, I916.

Renewed November 13, 1915. Serial No. 61.442.

rolls of both sets is positively driven. In the arrangement shown the rolls 2, 4, 7 and 9 are the positively driven rolls. The rolls 7 and 9 are driven in opposite directions to the rolls 2 and 4. 12 designates a die through which the rods or bars may pass after leaving the first group or set, and 13 a similar die beyond the rolls of the second group or set. Each pair of the cross rolls forms between them a cylindrical pass for the bars or rods, the surfaces of the rolls being shown as concaved 'so as to give a relatively long bearing contact in each pass. The Polls 2 and 3 act mainly as feed-in rolls, the main reduction taking place in the pass formed by the rolls 4: and 5. The roll 5 is shown as being somewhat shorter than the other rolls so as to give a central bearing on the rods or bars intermediate the end bearings of the roll 4:. In other words, the two rolls 4 and 5 provide for a three-point bearing on the rod being rolled, the roll 4 giving separated end bearings, and the roll 5 an intermediate opposite bearing. The rolls 7 and 8 and 9 and 10, as above stated, act as finishing rolls which, by their opposite direction of rotation, remove the spiral markings on the surfaces of the bars or rods imparted by the rolls of the first set. The pressure rolls 6 and 11 are made adjustable so as to give any desired holding pressure on the rods or bars intermediate the two pairs of rolls of the respective groups. The rolls 6 and 11 act as straightening rolls, being capable of ad justment so as to positively bend or deflect the bars or rods to one side of their normal line of feed, thereby eliminating kinks and bends. The two sets or groups may be arranged in tandem, as indicated in Fig. 2, or in any other desired or convenient relation. By providing at least two pairs of cross rolls in each set or group the bars or rods are effectively held against any tendency to deflect out of the line of the roll passes. This obviates the necessity for any guiding means additional to the cross rolls for preventing such deflection. The tandem ar rangement of the pairs of rolls of each set, especially when assisted by the action of the intermediate pressure roll, removes kinks or bends from the rods or bars, which are thus straightened as well as sized and surfaced. In Figs. 1 and 2 I have illustrated one form of the machine constituting one set or group of the rolls. In these figures the numeral 14 designates the frame of the machine provided with bearings 15 for the shafts of the positively driven rolls 2 and 4. The rolls 3 and 5 are carried by short skew shafts 16, mounted in yokes 17 adapted for both longitudinal and lateral ad ustment in suitable guides on the frame. To provide for this adjustment, the outer poi;- tion of each yoke has the transverse slots 18 and the guide portion of the frame has the longitudinal slots 19. The two slots of each pair of slots intersect each other, and the yokes are secured in proper ad justment by means of the bolts 20. For the purpose of adjusting the yokes laterally I provide the longitudmally extending screw shaft 21 having thereon wedge blocks 22 which, when the shaft 21 is rotated, are adapted to force the yokes inwardly and thus move the rolls 3 and 5 toward the rolls'2 and 4. The intermediate pressure roll 6 is mounted in a yoke 23 generally similar to the yokes of the rolls 3 and 5 and adjustable in the same manner and at the same time by the action of the shaft 21 and its wedges. The rolls 2 and l are shown as positively driven by an electric motor 24 whose armature shaft carries a pinion This pinion meshes with the gear 26 on an intermediate shaft 27 carrying a pinion 28 which meshes with the gear 29 on a shaft 30. The shaft 30 carries two pinions 31 and 32 which mesh respectix'ely with corresponding pinions 33 and 3% on the skew shafts of the rolls 2 and 4.

In Fig. 4 I have shown a modified arrangement of the cross rolls of the first group or set. In this form the first group or set of cross rolls consists of three pairs of rolls arranged in tandem. The rolls 35 and 36 of the first set constitute the feedin and straightening rolls and are shown as being similar to the rolls 4 and 5 of Fig. 3. The rolls 35 and 36 give a three-point bearing on the rod or bar, the roll 36 being capable of adjustment to deflect the rod or bar to one side of its normal line of feed. These rolls therefore act as straightening rolls, as well as feed-in rolls. The last pair of rolls of the set, designated as 37 and 38, are shown as similar to the rolls 2 and 3. The intermediate pair of rolls, designated as 39 and 40, are collar rolls. That is to say, the concave surface of each roll has a number of circumferentially extending collars 41. Each pair of opposite collars of the two rolls constitutes a separate reducing pass; and these successive collars are of such diameters that the successive passes formed thereby are of progressively decreasing diameter. Therefore in passing through this pair of rolls the rods or bars are subjected to a successive series of reductions. This breaking up of the. reduction into successive steps enables a much greater reduction to be obtained with very also straightened by a single operation. 4

Heretofore, it has been necessary to subject the bars or rods to a subsequent straightening process after the rolling is finished. The present arrangement of the rolls also gives a superior surface finish to the bars or rods.

It will be understood that I do not desire to limit myself to the particular embodiments of my invention which I have herein shown and described, as it is obvious that many changes can be made in the details of construction and the arrangement of the different cross rolls, without departing from the spirit and scope of my invention as defined in the claims.

WVhat I claim is:

1. The herein described method of cold rolling rods and round bars, which consists in subjecting the rods or bars to the action of successive pairs of cross rolls arranged in tandem, and simultaneously subjecting the bars to a bending action to straighten them; substantially as described.

2. The herein described method of cold rolling rods and round bars, which consists in subjecting the rods or bars to the action of a plurality of pairs of cross rolls, said rolls being arranged in groups or sets, and rotating corresponding rolls in the two groups in opposite directions to cause the rolls of one group to remove surface markings produced by the rolls of a preceding group; substantially as described.

3. The herein described method of cold rolling rods and round bars, which consists in subjecting the bars or rods to the sizing and reducing action of a set of cross rolls, and then subjecting them to the finishing action of another set of cross rolls, and rota-ting the second set of cross rolls in an opposite direction to the direction of rotation of the first set; substantially as described.

4. Cold rolling apparatus of the character described, comprising at least two pairs of cross rolls arranged in tandem and at least one pair of said rolls forming a reducing pass, and means whereby the bars or rods being rolled are subjected to a bending and straightening action while passing through the rolls; substantially as described.

5. Cold rolling apparatus of the character described, comprising a plurality of sets of cross. rolls, the rolls of one set forming reracemes duclng means and the other set forming.

finishing means, and corresponding rolls of the two sets being driven in reverse directions; substantially as described.

7 Gold rolling apparatus of the character described, comprising a pair of concavesurfaced cross rolls, said rolls having each a plurality of circumferential collars, opposite collars of the tworolls forming a successive series or reducing passes whose reducing walls are formed by the peripheral surfaces of the collars; substantially as described.

8. Cold rolling apparatus of the character described, comprisin three pairs of cross rolls arranged in tan em, the middle pair of rolls having collars which form a series of reducing passes between the two rolls, said passes having their reducing walls formed by the peripheral surfaces of said collars; substantially as described.

9. Cold rolling apparatus of the character described, comprising a set of cross rolls arranged in tandem and having reducing passes between them, and another set of cross rolls arranged in tandem and having finishing passes, corresponding rolls of the opposite two sets being driven in the opposite directions; substantially as described.

v10. Cold rolling apparatus of the character described, comprlsing a plurality of sets of cross rolls, the rolls of one set forming reducing and sizing means and the rolls of the other set forming finishing means, and a die in the line of feed of the rods or bars through said rolls and through which the bars or rods are fed; substantially as described.

11. Cold rolling apparatus of the character described, comprising a plurality of sets of cross rolls, the rolls of one set forming reducing and sizing means, and the rolls of the other set forming finishing means, said sets of rolls having means whereby the bars or rods are deflected or may be deflected to one side of their normal line of feed and thereby straighten while being reduced and finished; substantially as described.

In testimony whereof, I have hereunto set my hand.

PETTER Witnesses:

GEO. H. PARmrnE, H. M. Conwm.

'B. ABRAMSEN. 

